🧪 Volume Converter

Gallons to Liters
( gal → L )

Instantly convert US gallons to liters. Enter any value below and get an accurate result with the full formula and reference table.

Converter Tool
gal
L
Result
1 gal ≈ 3.7854 L
3.7854
L
The Formula
L = gal × 3.78541
1 US gallon = 3.785411784 L exactly. For everyday use, 3.78541 is sufficiently accurate.

How to Convert Gallons to Liters

To convert US gallons to liters, multiply the number of gallons by 3.78541. This factor comes from the definition of a gallon in the US customary system: 1 gal = 231 cubic inches, and 1 cubic inch = 16.387064 mL.

Step-by-Step Example

Let’s convert 2 gallons to liters:

1. Multiply by 3.78541: 2 × 3.78541 = 7.57082
2. So 2 gallons equals approximately 7.571 L.

For a smaller amount, 0.5 gallon × 3.78541 = 1.892705 L.

When You’d Use Each Unit

Gallons are commonly used in the US for measuring large volumes of liquids like gasoline, milk, or water. Liters are the standard metric unit for volume and are used worldwide for larger quantities, such as beverages, fuel, and containers. Converting between them is essential for understanding product volumes, fuel efficiency, and international recipes.

Conversion Table

Common gallons values converted to liters — typical values highlighted.

Gallons (gal) Liters (L) Approximate
Frequently Asked Questions
How do I convert gallons to liters quickly? +
Multiply by 3.8 for a rough estimate (e.g., 2 gallons ≈ 7.6 L). For exact conversion, multiply by 3.78541. This tool provides the precise value.
How many liters are in a gallon? +
There are approximately 3.78541 liters in one US gallon.
What is 1 gallon in L? +
1 gal ≈ 3.78541 L.
What is 1 L in gallons? +
1 L ≈ 0.264172 gal.
Is this the same as a UK gallon? +
No, UK gallons are about 4.54609 L. This converter uses the US gallon, which is the most common in US recipes and fuel measurements.
Can I convert liters back to gallons with this tool? +
Yes! Just type a value into the liters field and the gallons field updates automatically. Or use the ⇄ swap button to switch directions.
✓ Copied to clipboard!